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Analog Devices Inc. LTC3525DISC6-3.3#TRMPBF
- Part No.:
- LTC3525DISC6-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525DISC6-3.3#TRMPBF.pdf
- Description:
- IC REG BOOST 3.3V 140MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:491
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Product details
Overview
LTC3525DISC6-3.3#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous step-up DC/DC converter optimized for single-cell alkaline/NiMH or Li-ion battery-powered systems. It starts up from as low as 0.85V input, delivers fixed 3.3V output with up to 140mA at 1.8V input, and features Pass Through Mode in shutdown. Its 7µA quiescent current and 95% peak efficiency support long-life portable instrumentation and medical devices.
For engineers reviewing the LTC3525DISC6-3.3#TRMPBF datasheet, LTC3525DISC6-3.3#TRMPBF pinout, LTC3525DISC6-3.3#TRMPBF application, or LTC3525DISC6-3.3#TRMPBF equivalent, key selection criteria include ultra-low start-up voltage (0.85V), Pass Through Mode behavior, SC70-6 package thermal performance (θJA = 150°C/W), and Burst Mode® operation enabling sub-10µA no-load current.
Technical Context
The LTC3525DISC6-3.3#TRMPBF employs a hysteretic Burst Mode® control architecture with integrated 0.5Ω N-channel switch and 0.8Ω P-channel synchronous rectifier. It operates across VIN = 0.5V–4.5V and maintains regulation even when VIN ≥ VOUT, though synchronous rectification disables in that mode.
Startup uses an internal oscillator to bootstrap from ≤0.85V; once VOUT exceeds VIN by 0.2V and either rail reaches 1.8V, it transitions to normal synchronous operation. In shutdown, the P-channel MOSFET turns on, connecting VIN to VOUT through the external inductor-enabling true Pass Through Mode without diode drop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Start-Up Voltage | 0.85V minimum - enables operation from single alkaline or NiMH cell at end-of-life. |
| Fixed Output Voltage | 3.30V ±3% - tightly regulated for powering 3.3V logic, sensors, and RF modules. |
| Quiescent Current | 7µA typical - maximizes battery runtime in always-on or infrequently active systems. |
| Peak Switch Current | 400mA - supports up to 140mA output at 1.8V input while maintaining regulation. |
| Efficiency | Up to 95% - achieved via synchronous rectification, eliminating Schottky diode losses. |
| Shutdown Behavior | Pass Through Mode - VIN directly connected to VOUT through inductor, minimizing dropout. |
| Operating Junction Temp | –40°C to 125°C - qualified for industrial and extended-temperature embedded applications. |
| Package | 6-Lead SC70 (SC6) - 2.0mm × 1.25mm footprint with 1mm profile, suitable for space-constrained PCBs. |
Pinout & Package
Package: 6-Lead Plastic SC70 (SC6), 2.0mm × 1.25mm × 1.0mm, 150°C/W thermal resistance on ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-Controlled Shutdown Input | Pull <0.4V to enable Pass Through Mode; pull >1V to activate converter. Avoid 0.5–1V range to prevent test mode activation. |
| GND (Pins 2, 5) | Power Ground Reference | Dual ground pins reduce impedance and improve thermal dissipation; both must be connected to low-impedance ground plane. |
| VIN (Pin 3) | Main Input Supply | Accepts 0.5V–4.5V; powers IC until VOUT exceeds VIN + 0.2V, then switches to VOUT supply path. |
| VOUT (Pin 4) | Regulated Output & Sense Node | Delivers 3.3V; connects to output capacitor (min. 10µF ceramic); serves as pass-through path during shutdown. |
| SW (Pin 6) | Switch Node | Drives external inductor; includes internal anti-ringing resistor to suppress EMI at zero-current crossing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | 7µA quiescent current enables >1-year battery life in low-duty-cycle glucose meters and remote sensors. |
| Pass Through Mode | VIN-to-VOUT connection in shutdown eliminates diode forward drop, preserving system-level efficiency during standby. |
| Ultra-Low Start-Up Voltage | 0.85V start capability ensures reliable boot from aging alkaline cells down to ~0.9V open-circuit voltage. |
| Integrated Power Switches | 0.5Ω NMOS + 0.8Ω PMOS switches reduce conduction loss and eliminate need for external Schottky diode. |
| Anti-Ringing Control | Internal resistor across SW–VIN damps LC ringing at switch turn-off, lowering EMI without external snubbers. |
| Thermal Shutdown | Protects against sustained overload or poor PCB layout; device resumes operation after junction cools below threshold. |
Applications
| Glucose Meters | Portable Instrumentation |
|---|---|
Use Scenario: Battery-powered handheld medical device requiring stable 3.3V rail from single AA/AAA cell over full discharge curve. IC Role / Device Role / Timing Role: Primary voltage booster enabling microcontroller, LCD, and electrochemical sensor interface at low input voltage. Use Value: 0.85V start-up and 7µA IQ extend usable battery life by >30% versus charge-pump alternatives. |
Use Scenario: Handheld multimeter or data logger powered by two NiMH cells (2.4V fully charged, ~1.6V depleted). IC Role / Device Role / Timing Role: Efficient 3.3V generation for precision ADC, op-amps, and wireless transceiver during intermittent measurement cycles. Use Value: Pass Through Mode maintains VOUT ≈ VIN during sleep, reducing standby power loss vs. conventional boost converters. |
| Digital Cameras (Low-Power Mode) | MP3 Players (Battery Backup Rail) |
Use Scenario: Compact camera module where main SoC runs at 1.2V but image sensor and flash driver require 3.3V only during capture bursts. IC Role / Device Role / Timing Role: On-demand 3.3V source activated only during sensor readout or flash charging, minimizing average current draw. Use Value: Burst Mode® delivers high peak current (400mA) with minimal light-load penalty, supporting fast wake-up from deep sleep. |
Use Scenario: Portable audio player using Li-ion battery (3.0–4.2V) but needing regulated 3.3V for DAC, codec, and memory interface. IC Role / Device Role / Timing Role: Maintains clean 3.3V supply during battery voltage sag under headphone load; enters Pass Through Mode when battery drops near 3.3V. Use Value: Seamless transition between boost and direct-conduction modes avoids brownout resets during dynamic load changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3525-3.3#TRMPBF | Same topology and pinout, but Output Disconnect (not Pass Through) in shutdown - VOUT floats instead of connecting to VIN. | Suitable where output isolation during shutdown is required, e.g., to prevent backfeed into sensitive analog circuitry. | Select LTC3525DISC6-3.3#TRMPBF when VIN-to-VOUT continuity in shutdown is mandatory; choose LTC3525-3.3#TRMPBF when output disconnection is preferred. |
| LTC3429#TRMPBF | Also SC70-6, 500kHz switching, but includes Output Disconnect and higher 600mA peak current; IQ = 20µA, start-up at 1.0V. | Better suited for higher-output-current applications (>140mA) or where 1.0V minimum start-up is acceptable. | LTC3429#TRMPBF offers greater current headroom and integrated disconnect, but sacrifices ultra-low start-up voltage and adds 13µA quiescent current. |
Compared with LTC3525-3.3#TRMPBF, the LTC3525DISC6-3.3#TRMPBF provides critical Pass Through Mode functionality at identical footprint and efficiency, while LTC3429#TRMPBF trades start-up voltage and IQ for higher current capability and built-in disconnect - making each optimal for distinct system-level power sequencing requirements.
Availability
LTC3525DISC6-3.3#TRMPBF is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, low-power digital cameras, and consumer audio equipment requiring stable component supply across industrial temperature ranges.
Supply support for LTC3525DISC6-3.3#TRMPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LTC3525D family was designed specifically for ultra-low-voltage, micropower boost conversion in space- and battery-constrained portable electronics - emphasizing startup reliability, efficiency at microamp loads, and minimal external component count.
FAQ
What is the minimum input voltage required for the LTC3525DISC6-3.3#TRMPBF to start switching?
The LTC3525DISC6-3.3#TRMPBF guarantees startup from 0.85V input under specified conditions. This allows reliable operation from a single alkaline or NiMH cell even at end-of-life. Startup requires both VOUT exceeding VIN by 0.2V and either VIN or VOUT reaching ≥1.8V; below those thresholds, the device remains in start-up oscillator mode.
How does Pass Through Mode work in the LTC3525DISC6-3.3#TRMPBF during shutdown?
In shutdown (SHDN < 0.4V), the LTC3525DISC6-3.3#TRMPBF turns on its internal P-channel MOSFET, creating a low-resistance path from VIN to VOUT through the external inductor. This bypasses the boost regulation path, resulting in minimal voltage drop (≈ RDS(on) × ILOAD) - unlike Output Disconnect variants where VOUT floats.
What is the maximum continuous output current the LTC3525DISC6-3.3#TRMPBF can deliver at 3.3V?
The LTC3525DISC6-3.3#TRMPBF delivers up to 140mA at 3.3V when VIN = 1.8V, and up to 60mA when VIN = 1.0V - values confirmed in Typical Performance Characteristics (Fig G01, G02). Peak switch current is rated at 400mA, but practical output current depends on input voltage, inductor value, and thermal design.
Can the LTC3525DISC6-3.3#TRMPBF operate with input voltage higher than its 3.3V output?
Yes - the LTC3525DISC6-3.3#TRMPBF supports VIN ≥ VOUT operation. However, in this mode the synchronous rectifier is disabled, reducing efficiency and limiting maximum output current. The device remains functional but behaves more like a passive pass-through regulator rather than an active boost converter.
What external components are required for basic operation of the LTC3525DISC6-3.3#TRMPBF?
Only three external components are required: a 10µH inductor (e.g., Murata LQH32CN100K53), a 10µF ceramic output capacitor (X5R/X7R), and a 1µF ceramic input bypass capacitor. No feedback resistors or compensation networks are needed - the 3.3V output is internally fixed, simplifying layout and reducing BOM count.
Is the LTC3525DISC6-3.3#TRMPBF RoHS-compliant and lead-free?
Yes - the LTC3525DISC6-3.3#TRMPBF carries the #TRMPBF suffix, indicating tape-and-reel packaging with 100% matte tin (lead-free) finish, compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1 marking standards.
LTC3525DISC6-3.3#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.5V
- Voltage - Input (Max):
- 4.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 140mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
LTC3525DISC6-3.3#TRMPBF FAQ
1.How can I place an order for LTC3525DISC6-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525DISC6-3.3#TRMPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3525DISC6-3.3#TRMPBF reliable?
The price and inventory of LTC3525DISC6-3.3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525DISC6-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3525DISC6-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525DISC6-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525DISC6-3.3#TRMPBF?
LTC3525DISC6-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525DISC6-3.3#TRMPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3525DISC6-3.3#TRMPBF?
For technical support, including LTC3525DISC6-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525DISC6-3.3#TRMPBF requirements.
6.How does Aetrix verify that LTC3525DISC6-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3525DISC6-3.3#TRMPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3525DISC6-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3525DISC6-3.3#TRMPBF?
All LTC3525DISC6-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525DISC6-3.3#TRMPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3525DISC6-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3525DISC6-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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